I bought a brand new iMac on Tuesday. I'm pretty sure this will come as a surprise to some, so I figured I might as well offer some background information about this choice - maybe it'll help other people who are also pondering what to buy as their next computer.

I use Glary Utilities to fix a lot of the cruft in my Windows installs. It may not make much of a dent in that 23GB you have, but it might be worth a shot. Get the non-toolbar version from their site, or if you install it via ninite.com you don't have to worry about that at all.

Also, if you're running x64 Windows it will take up much more space than x86. To me it's worth the bloat to be able to run with 8GB of RAM.

EDIT: Just checked my Windows directory and it's at 17GB on a four month old install of Windows 7 Ultimate x64.